Builders Warehouse SPAM

So I asked Builders Warehouse for a quotation which they responded to very quickly. The only problem is they quoted the incorrect product, and they have since sent me an average of 3 spam emails every weekday since. I have completed the unsubscribe options multiple times and continued to receive their spam with no change. I have even emailed them about the issue only to get no response. I currently never want to spend another cent at Builders Warehouse.